Had experience with both of these and several others, so far the best bang for the buck has been the Eagletree Vector for versatility in flight perameters and data logging. The Rvosd is a rather complicated one to get set up correctly unless the version 6 was simplified, the 5.1 is no longer supported and 2 of the 5 units of mine have catastrophic failure. If looking for a very simple setup with minimal hassle, look at Storm or Feiyu Tech fy-41, there both single units with a current sensor and work rather well and very reliable but no data logging. The Feiyu Tech does have capability for a ground station control like the Rvosd 6 but requires extra equipment involved. Just keeping it just to the basic functions, there's quite a selection out there. As for what I prefer after the latest testing, have been veered towards the Vector after test flying this weekend with awesome results. This was a Prototype Ritewing Drak and couldn't have been a better match for the plane, just had to get the launch technique down first.